Nibu, A George; Jyotsna, R; Thomas Lee, S; Aneeshkumar, B; Jayan,Thomas; Nampoori, V P N; Radhakrishnan, P(Elsevier, 2005)
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Abstract:
Photoacoustic spectrum of samarium phthalocyanine powder is recorded and compared with previously reported UV–vis absorption spectra of the same dissolved in different liquid and solid host media. The Davidov splitting of Q band is observed in the PA spectrum but the two bands are overlapped considerably and the shorter wavelength band is more intense and dominating one in the powder spectrum.
Anantharaman, M R; Saravanan, S; Venkatachalam, S(Elsevier, August 20, 2006)
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Abstract:
Polyaniline and oligomeric cobalt phthalocyanine are blended in different proportions by chemical methods. These blends are characterised by
spectroscopic methods and dielectric measurements. Dielectric studies on the conducting polymer blends are carried out in the frequency range of
100 kHz to 5MHz from room temperature (300 K) to 373 K. Dielectric permittivity and dielectric loss of these blends are explained on the basis
of interfacial polarisation. From the dielectric permittivity studies, ac conductivity of the samples were calculated and the results are correlated. In
order to understand the exact conduction mechanism of the samples, dc electrical conductivity of the blends is carried out in the temperature range
of 70–300 K. By applying Mott’s theory, it is found that the conducting polymer composites obey a 3D variable range hopping mechanism. The
values of Mott’s temperature (T0), density of states at the Fermi energy (N(EF)), range of hopping (R) and hopping energy (W) for the composites
are calculated and presented
Description:
Materials Science and Engineering B 135 (2006) 113–119